Improvement in rock-drilling machinery



S. ING'ERSOLL.

ROCK DRILLING MACHINERY.

No. 179,561, Patented July 4,1876..

NPETERS. PNOYD-LITHUGRAPNEH. WASHINGTON, D CA I Fa SIMON INGERSOLL, OF STAMFORD, CONNECTICUT.

IMPROVEMENT IN ROCK-DRILLINGiNIACHlNERV.

Specification forming part of Letters Patent No. 179,561., dated July 4, 1876 application lile d November 13, 1875. Y

To all whom it may concern: 4

Bc it known that I, SIMON INGERsoLL, of Stamford, Fairfield county, in the State of Conpecticut, have invented certain Improvements relating to Rock-Drilling Machinery, of which the following is a specication: v

The invention pertains to apparatus for drilling by steam or analogous power, mounted on a suitable tripod, and capable of being` convenien tly shifted in position to drill in various directions. One portion relates to means for reciprocating the valve, and another to means for operating the feed mechanism.

The accompanying drawings form a part of this specification, and represent what I consider the best means of carrying out the invention.

Figurel is a central longitudinal section. Fig. la represents a part in section on alarger scale. Fig. 2 is a section in a plan'e at right angles to Fig. l. Fig. 2fL is a cross-section through a portion of the details. Fig. 3 is a cross-section on the line :n x in Figs. l and 2.

. Fig. 4L is a view of the head with the outer plate removed.

Similar letters of reference indicate corresponding parts in all the gures.

A is a shaft or axis, having legs, (not represented,) forming therewith a tripod for supporting the other parts, and equipped with -ordinary or suitable facilities for standing firmly on the rock, and for being set in adjustable positions. B C are cheeks, embracing the shaft A, and adapted to be firmly set thereon by mcansfof the screw-bolts b b. Gr is a cylinder, of considerably larger bore than the piston, and having bushings g g applied in each end,reaching inward toward each other, but leaving a considerable space between their inner ends. The interior of these bushings is the true cylinder, within which works the tight-fitting piston H, of sufficient length to always extend across the intermediate space and form a tight-workin g piston in each of the bushings. A swell, H', is cast, welded, or

otherwise lirmly set, extending around this long piston at the center of its length.

The steam is admitted alternately through ports to the opposite ends of the cylinder, and acts against the two ends of the long piston.

The exhaust-passages are so arranged that source, (not represented,) and operating the piston by alternately inducting and educting steam from the two ends of the cylinder, all being conducted in the ordinary manner, except in the means employed for workingv the valve. The swell H', being continuous and smoothly rounded, is 'adapted' to strike the lower arms of the three-armed lever I alternately, and to throw the valve, and the piston may be revolved at will without affecting the action. The swelLH' may move past either arm without producing any effect after the arm is passed, and in such condition no -contact is possible between the arms of the lever I and the working-surface H of the piston.

The steam is inducted through the flexible hose s. It is discharged through the passage t, in free communication with the entire space around the piston H, between the bushings g g. The strong blast of exhaust drives out any water or oil which might otherwise accumulate within the cavity.

K lois atappet or sliding pin, adapted to move inward and outward to a limited extent. The

part lo is cylindrical, and tits ts'inclosing hole with only tolerable tightness. The head K has a ground face, adapted tomatch against the seat when the pin is forced inward. The inner end of the pin K 7c presses against alever, Z, turning on a center, z, and having an inclined end, which is in position to be touched by the swell H', and forced outward at the cxtreme end of its downstroke. Unless the piston makes a full downstroke it will not push out the tappet K lo to its full extent.

L is a lever, pivoted to the cylinder G at the point l. One arm is acted on by a spring,

m the other presses inward the tappet K 7c bythe force of such spring. One end of the lever L beyond the spring m is widened, and carries a pin, n, and a spring, n'. A pawl, N, is iitted on the pin u, and is pressed by the force of the spring n' into contact with rigid teeth, which are formed on the periphery of the stout nut-piece P, which is-housed in a lateral extension of one head ot' the cylinder G, as represented. The feed-screw R'is equipped with a crank, as shown, and takes hold of an arm, D', from the cradle D, by holding it between the hub of the'cranlr and a collar on thepfeed-screw. The feed-screw is threaded through the nut-piece P. When desired, the attendant turns the feed-screw R by its crank, and thus raises it up orfeeds it down, as desired. When the drill is in operation and it is desired to feed automatically he allows the pawl N to act on the ratchet-teeth ofthe nut-piece P.

Where I have spoken of the steam-admission, Ste., it will be understood to apply equally well itl the machine is worked by other Iluids, as compressed air.

I propose to employ india-rubber under the head K of the'pin K k to aid in forming a tight seat.

Figure l shows a slight Iiange on the end of the bushing. This is matched into a corre.- sponding rapbbet in the cylinder; and, although too small to be well shown in Fig. l, performs an important duty by keeping the bushing rmly in place.

I propose to employ all the ordinary adjuncts for the successful working of my apparatus. Thus, the piston-rod should have a stuffing-box, and the cylinder ends may each have a thick rubber cushion.

By removing one of the bushings g g I am able to get the piston H in and out-an operation which would otherwise be prevented by the swell H', provided the swell were always larger than the working part of the piston.

Some of the advantages, due to certain features of the invention, may be separately enumerated as follows: First, by reason of my partial bushings g g, I not only obtain easily exchangeable surfaces to receive the wear, but also allow the introduction ot' a piston with a fixed swell in the center of its length, having a larger diameter than the working portion of the piston; second, by

reason of my swell H' in the-piston, I am able to throw the lever I, and consequently the valve J, with certainty, to effect those ends with light and compact mechanism, and to allowthe piston to move beyond the levers to any desired extent without rubbing or in any way affecting the working-surfaces of the piston, third, by reason of the construction of the tappet K 7c and .its seat, fitting steamtight when the tappet is moved inward, I insure that no steam or water shall be thrown out, and that no grit shall be drawn inward in consequence ct' any partial vacuum in the exhaust-passages; fourth, by reason of. my mechanism having independently ofthe hinge a the little spring a' under the widened end of the lever L, I am able, by light and simple means, to hold the pawl N in contact with the ratchet with certainty.

I claim as my improvements in rockdrill ing machinesl. lllhe swell H', of larger diameter than the central part of the piston II, and extending around the saine, in combination with the partial bushings g g, arranged at a distance apart, as shown, and with the cylinder G, as specilied.

2. The pinsK 7c, having the head K fitted steam-tight, in combination with the piston H I-I', and with the pawl N n, spring n', spring m, and levers L Z Z a, as herein specified.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

SIMON INGE RSOLL.

Witnesses G. C. S'rE'rsoN, HENRY GENTNER. 

